ANDROID: rockchip: Disable HISPD mode on eMMC

Using certain hs400es-capable eMMC modules on RockPi 4b v1.4 seems to
cause instability in U-Boot. Disabling HISPD mode fixes it.

Change-Id: I66e623feb0f7e9fd5d1c32a419525d60fdbe61f2
Signed-off-by: Alistair Delva <adelva@google.com>
1 file changed