Update api.h

Add feature bits from [here](https://github.com/torvalds/linux/blob/abf2050f51fdca0fd146388f83cddd95a57a008d/arch/arm64/include/uapi/asm/hwcap.h#L99-L104).

Author: gonnet

src/arm/linux/api.h

@@ -139,6 +139,11 @@ struct cpuinfo_arm_linux_proc_cpuinfo_cache {
 #define CPUINFO_ARM_LINUX_FEATURE2_BTI UINT32_C(0x00020000)
 #define CPUINFO_ARM_LINUX_FEATURE2_SME UINT32_C(0x00800000)
 #define CPUINFO_ARM_LINUX_FEATURE2_SME2 UINT64_C(0x0000002000000000)
+#define CPUINFO_ARM_LINUX_FEATURE2_SME2P1 UINT64_C(0x0000004000000000)
+#define CPUINFO_ARM_LINUX_FEATURE2_SME_I16I32 UINT64_C(0x0000008000000000)
+#define CPUINFO_ARM_LINUX_FEATURE2_SME_BI32I32 UINT64_C(0x0000010000000000)
+#define CPUINFO_ARM_LINUX_FEATURE2_SME_B16B16 UINT64_C(0x0000020000000000)
+#define CPUINFO_ARM_LINUX_FEATURE2_SME_F16F16 UINT64_C(0x0000040000000000)
 #endif
 
 #define CPUINFO_ARM_LINUX_VALID_ARCHITECTURE UINT32_C(0x00010000)