ARM: cache: remove ARMv3 support code

This is only used by 740t, which is a v4 core and (by my reading of the
datasheet for the CPU) ignores CRm for the cp15 cache flush operation,
making the v4 cache implementation in cache-v4.S sufficient for this
CPU.

Tested with 740T core-tile on Integrator/AP baseboard.

Acked-by: Hyok S. Choi <hyok.choi@samsung.com>
Acked-by: Greg Ungerer <gerg@uclinux.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index 025d173..4045c49 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -43,7 +43,7 @@
 	depends on !MMU
 	select CPU_32v4T
 	select CPU_ABRT_LV4T
-	select CPU_CACHE_V3	# although the core is v4t
+	select CPU_CACHE_V4
 	select CPU_CP15_MPU
 	select CPU_PABRT_LEGACY
 	help
@@ -469,9 +469,6 @@
 	bool
 
 # The cache model
-config CPU_CACHE_V3
-	bool
-
 config CPU_CACHE_V4
 	bool