android_boot: Don't disable EFI runtime services

GBL shouldn't be meddling with this option. Instead the firmware should
decide if the platform can support EFI runtime services or not.
If the platform wants to disable runtime services, it can pass the
"efi=noruntime" option in the DT, or modify the EFI_RT_PROPERTIES_TABLE.

Note: x86_64 cuttlefish can boot with EFI runtime services enabled.
It's still unclear why arm64 cuttlefish cannot boot with runtime
services. We should either fix arm64 cuttlefish, or update the DT of
arm64 cuttlefish with "efi=noruntime".

Bug: 557082099
Bug: 477970734
Test: boot test on arm64 and x86_64 cuttlefish
Change-Id: Ic3f094ba7e1e611902bd4283ef134dfe5f530504