[source] include: Cortex-A53 is also an AArch64 CPU

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/57fb5c08f53b3ff02d1c84c23275f5eeef30ef7b

commit 57fb5c08f53b3ff02d1c84c23275f5eeef30ef7b
Author: Florian Fainelli <f.fainelli at gmail.com>
AuthorDate: Thu Nov 3 11:16:28 2016 -0700

    include: Cortex-A53 is also an AArch64 CPU
    
    Specifying a mtune option with cortex-a53 is also valid for an aarch64
    toolchain
    
    Fixes: SVN 48964
    Signed-off-by: Florian Fainelli <f.fainelli at gmail.com>
---
 include/target.mk | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/target.mk b/include/target.mk
index c9c02fa..a8d3b2b 100644
--- a/include/target.mk
+++ b/include/target.mk
@@ -212,6 +212,7 @@ ifeq ($(DUMP),1)
   ifeq ($(ARCH),aarch64)
     CPU_TYPE ?= armv8-a
     CPU_CFLAGS_armv8-a = -mcpu=armv8-a
+    CPU_CFLAGS_cortex-a53 = -mcpu=cortex-a53
   endif
   ifeq ($(ARCH),arc)
     CPU_TYPE ?= arc700