arm: armv8: remove redundant definition of mmu_status

mmu_status is used in io memcpy functions to prevent accesses to non
8-byte aligned addresses when the mmu is disabled. Though there is a
redundant definition enabled when icaches is turned off by setting
SYS_ICACHE_OFF.

This patch removes the redundant definition, allowing mmu_status to
properly report the status regardless of config settings. This shouldn't
be a problem since access to non 8-byte aligned data can be done
irrespective of icache state.

Fixes: 268f6ac1f9 ("arm64: Update memcpy_{from, to}io() helpers")

Signed-off-by: Anshul Dalal <anshuld@ti.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>
Reviewed-by: Dhruva Gole <d-gole@ti.com>
Acked-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>

arch/arm/cpu/armv8/cache_v8.c

@@ -1134,11 +1134,6 @@ int icache_status(void)
 	return (get_sctlr() & CR_I) != 0;
 }
 
-int mmu_status(void)
-{
-	return (get_sctlr() & CR_M) != 0;
-}
-
 void invalidate_icache_all(void)
 {
 	__asm_invalidate_icache_all();
@@ -1160,17 +1155,17 @@ int icache_status(void)
 	return 0;
 }
 
-int mmu_status(void)
-{
-	return 0;
-}
-
 void invalidate_icache_all(void)
 {
 }
 
 #endif	/* !CONFIG_IS_ENABLED(SYS_ICACHE_OFF) */
 
+int mmu_status(void)
+{
+	return (get_sctlr() & CR_M) != 0;
+}
+
 /*
  * Enable dCache & iCache, whether cache is actually enabled
  * depend on CONFIG_SYS_DCACHE_OFF and CONFIG_SYS_ICACHE_OFF