ARM: shmobile: Kconfig: remove obsolete option ARCH_R8A7778

Obsoleted by removal of r8a7778 legacy platform.
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@gmail.com>
Acked-by: by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>

arch/arm/mach-shmobile/Kconfig

@@ -103,12 +103,6 @@ if ARCH_SHMOBILE_LEGACY
 
 comment "Renesas ARM SoCs System Type"
 
-config ARCH_R8A7778
-	bool "R-Car M1A (R8A77781)"
-	select ARCH_RCAR_GEN1
-	select ARCH_WANT_OPTIONAL_GPIOLIB
-	select ARM_GIC
-
 config ARCH_R8A7779
 	bool "R-Car H1 (R8A77790)"
 	select ARCH_RCAR_GEN1