Remove workaround for cortex-a55/a75

Test: m checkbuild
Test: boot on a55/a75 device, pass bionic tests
Bug: 110235326
Change-Id: I5ab2102352a6efe1173b3097875e6e779d4a1a09
diff --git a/cc/config/arm_device.go b/cc/config/arm_device.go
index 398df90..4719fb7 100644
--- a/cc/config/arm_device.go
+++ b/cc/config/arm_device.go
@@ -100,7 +100,7 @@
 			"-D__ARM_FEATURE_LPAE=1",
 		},
 		"cortex-a55": []string{
-			"-mcpu=cortex-a53",
+			"-mcpu=cortex-a55",
 			"-mfpu=neon-fp-armv8",
 			// Fake an ARM compiler flag as these processors support LPAE which GCC/clang
 			// don't advertise.
@@ -109,7 +109,7 @@
 			"-D__ARM_FEATURE_LPAE=1",
 		},
 		"cortex-a75": []string{
-			"-mcpu=cortex-a53",
+			"-mcpu=cortex-a55",
 			"-mfpu=neon-fp-armv8",
 			// Fake an ARM compiler flag as these processors support LPAE which GCC/clang
 			// don't advertise.