meta-agl-bsp: reference hardware updates for BSP v5.5.0

meta-agl-bsp: reference hardware updates for BSP v5.5.0

Update the AGL reference hardware devicetree and U-Boot configuration
names to work with the Renesas BSP v5.5.0 update and related
meta-agl-refhw changes.

Bug-AGL: SPEC-4103

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
(cherry picked from commit fe29f1717f6ee309273507724c488a6b5fbb5598)
Change-Id: I94db9390c2ec3d2b0cd9b1c0167570d813f2bae3
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/26867
Tested-by: Jenkins Job builder account
ci-image-build: Jenkins Job builder account
ci-image-boot-test: Jenkins Job builder account
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>