arm: mach-k3: Move mmr_unlock to a common location

mmr_unlock api is common for all k3 devices. Move it to a common
location.

Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Reviewed-by: Suman Anna <s-anna@ti.com>
diff --git a/arch/arm/mach-k3/common.h b/arch/arm/mach-k3/common.h
index ba344c5..44cf94a 100644
--- a/arch/arm/mach-k3/common.h
+++ b/arch/arm/mach-k3/common.h
@@ -22,3 +22,4 @@
 int load_firmware(char *name_fw, char *name_loadaddr, u32 *loadaddr);
 void k3_sysfw_print_ver(void);
 void spl_enable_dcache(void);
+void mmr_unlock(phys_addr_t base, u32 partition);