bsd-user:Add ARM AArch64 support and capabilities

Added function to access rval2 by accessing the x1 register.
Defined ARM AArch64 ELF parameters including mmap and dynamic load addresses.
Introduce

bsd-user:Add ARM AArch64 support and capabilities

Added function to access rval2 by accessing the x1 register.
Defined ARM AArch64 ELF parameters including mmap and dynamic load addresses.
Introduced extensive hardware capability definitions and macros for retrieving hardware capability (hwcap) flags.
Implemented function to retrieve ARM AArch64 hardware capabilities using the `GET_FEATURE_ID` macro.
Added function to retrieve extended ARM AArch64 hardware capability flags.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Co-authored-by: Kyle Evans <kevans@FreeBSD.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240707191128.10509-4-itachis@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>

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bsd-user:Add AArch64 register handling and related functions

Added header file for managing CPU register states in FreeBSD user mode.
Introduced prototypes for setting and getting thread-local stora

bsd-user:Add AArch64 register handling and related functions

Added header file for managing CPU register states in FreeBSD user mode.
Introduced prototypes for setting and getting thread-local storage (TLS).
Implemented AArch64 sysarch() system call emulation and a printing function.
Added function for setting up thread upcall to add thread support to BSD-USER.
Initialized thread's register state during thread setup.
Updated ARM AArch64 VM parameter definitions for bsd-user, including address spaces for FreeBSD/arm64 and
a function for getting the stack pointer from CPU and setting a return value.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Ajeet Singh <itachis@FreeBSD.org>
Co-authored-by: Jessica Clarke <jrtc27@jrtc27.com>
Co-authored-by: Sean Bruno <sbruno@freebsd.org>
Co-authored-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20240707191128.10509-3-itachis@FreeBSD.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>

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