warnings: fix missing field in initializer

use generic struct zero initializer instead.
Older gcc used on arm also seem to have trouble with '{}',
so use '{ 0 }' instead

Change-Id: I83d43b05f8d1d44e1dd86502b48e28fe242e1db2

arch/arm64/kernel/cpufeature.c

@@ -970,7 +970,7 @@ static const struct arm64_cpu_capabilities arm64_elf_hwcaps[] = {
 #ifdef CONFIG_ARM64_SVE
 	HWCAP_CAP(SYS_ID_AA64PFR0_EL1, ID_AA64PFR0_SVE_SHIFT, FTR_UNSIGNED, 1, CAP_HWCAP, HWCAP_SVE),
 #endif
-	{},
+	{ 0 },
 };
 
 /* @ref.impl arch/arm64/kernel/cpufeature.c */

arch/arm64/kernel/cputable.c

@@ -10,5 +10,5 @@ struct cpu_info cpu_table[] = {
 		.cpu_name	= "AArch64 Processor",
 		.cpu_setup	= __cpu_setup,
 	},
-	{ /* Empty */ },
+	{ 0 },
 };

executer/user/mcexec.c

@@ -3158,7 +3158,7 @@ struct overlay_blacklist_entry {
 	{ "/sys/devices/system/node/has%c", -1, -1, '_' },
 	{ "/sys/fs/cgrou%c", -1, -1, 'p' },
 	{ "/sys/devices/pci%*[^/]/%*[^/]/local_cpu%c", -1, -1, 's' },
-	{ NULL, 0, 0 },
+	{ 0 },
 };
 
 int overlay_blacklist(const char *path)