[RCAR][upstream] remove dts patch for SDIO frequency

[RCAR][upstream] remove dts patch for SDIO frequency

Bug-AGL: SPEC-1945

Latest meta-rcar update SDIO frequency for TI's WLAN driver.
However, in M3 case, the this patch raise ti/wlcore driver WANING.

[  107.009706] ------------[ cut here ]------------
[  107.014342] WARNING: CPU: 0 PID: 4224 at /kernel-source//drivers/net/wireless/ti/wlcore/sdio.c:145 wl12xx_sdio_raw_write+0xb0/0x160 [wlcore_sdio]
[  107.027375] Modules linked in: rfcomm 8021q garp stp mrp llc can_bcm can bnep nfc arc4 wl18xx wlcore mac80211 cfg80211 crc32_ce crct10dif_ce btwilink bluetooth ecdh_generic wlcore_sdio rcar_can st_drv rfkill can_dev vspm_if(O) vsp2(O) vspm(O) uvcs_drv(O) sllin(O) pvrsrvkm(O) mmngrbuf(O) mmngr(O) hdm_usb(O) hdm_i2c(O) hdm_dim2(O) aim_v4l2(O) aim_sound(O) aim_network(O) aim_cdev(O) mostcore(O) ipv6
[  107.062537] CPU: 0 PID: 4224 Comm: wpa_supplicant Tainted: G           O    4.14.35-yocto-standard #1
[  107.071749] Hardware name: Renesas M3ULCB Kingfisher board based on r8a7796 (DT)
[  107.079138] task: ffff8005fc610e00 task.stack: ffff000020bc8000
[  107.085054] PC is at wl12xx_sdio_raw_write+0xb0/0x160 [wlcore_sdio]
[  107.091316] LR is at wl12xx_sdio_raw_write+0x7c/0x160 [wlcore_sdio]

<snip>

[  107.467808] ---[ end trace 0140d637a5afd50b ]---
[  107.472613] wl1271_sdio mmc2:0001:2: sdio write failed (-84)
[  107.478340] ------------[ cut here ]------------
[  107.483008] WARNING: CPU: 0 PID: 4224 at /kernel-source//drivers/net/wireless/ti/wlcore/main.c:796 wl12xx_queue_recovery_work.part.26+0x58/0x60 [wlcore]
[  107.496648] Modules linked in: rfcomm 8021q garp stp mrp llc can_bcm can bnep nfc arc4 wl18xx wlcore mac80211 cfg80211 crc32_ce crct10dif_ce btwilink bluetooth ecdh_generic wlcore_sdio rcar_can st_drv rfkill can_dev vspm_if(O) vsp2(O) vspm(O) uvcs_drv(O) sllin(O) pvrsrvkm(O) mmngrbuf(O) mmngr(O) hdm_usb(O) hdm_i2c(O) hdm_dim2(O) aim_v4l2(O) aim_sound(O) aim_network(O) aim_cdev(O) mostcore(O) ipv6
[  107.531806] CPU: 0 PID: 4224 Comm: wpa_supplicant Tainted: G        W  O    4.14.35-yocto-standard #1
[  107.541018] Hardware name: Renesas M3ULCB Kingfisher board based on r8a7796 (DT)
[  107.548406] task: ffff8005fc610e00 task.stack: ffff000020bc8000
[  107.554363] PC is at wl12xx_queue_recovery_work.part.26+0x58/0x60 [wlcore]
[  107.561265] LR is at wl12xx_queue_recovery_work+0x1c/0x28 [wlcore]

Change-Id: I6f15251e6997f52892efd118e8941af5930c5ca9
Signed-off-by: Harunobu Kurokawa <harunobu.kurokawa.dn@renesas.com>
(cherry picked from commit b142e42f4fd851a4f8a016cbffb0473f3b88419e)