Revert "mb/google/brya: Define a more suitable MRC training text message"

This reverts commit e45f70423e.

Reason for revert: Merged out of order, broke tree

Signed-off-by: Jakub Czapiga <jacz@semihalf.com>
Change-Id: I38a7be6b94199d3a23e78114fb6708c535f241cc
Reviewed-on: https://review.coreboot.org/c/coreboot/+/71279
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Martin Roth <martin.roth@amd.corp-partner.google.com>

src/mainboard/google/brya/Kconfig

@@ -332,7 +332,4 @@ config PCIEXP_DEFAULT_MAX_RESIZABLE_BAR_BITS
 	int
 	default 32
 
-config MEMORY_TRAINING_TEXT
-	default "Your device is finishing an update. This may take 1-2 minutes.\\Please do not turn off your device."
-
 endif # BOARD_GOOGLE_BRYA_COMMON