Fix arm64 32bit pcc for cpu-freq scaling

This PR is to fix cpu frequency scaling in some arm64 platform 1): the current acpi_pcc.c do not handle for **reg->BitWidth = 32** case，therefore some arm64 platform failed with Data aligment abort when init cppc 2): the current acpi_pcc.c mis-use mask when write new cpu freq into pcc channel ```c static ACPI_STATUS pcc_send_command(struct pcc_subspace *ss, ACPI_GENERIC_ADDRESS *reg, uint32_t command, int flags, ACPI_INTEGER val) { ... if ((flags & PCC_WRITE) != 0) { mask = __BITS(reg->BitOffset + reg->BitWidth - 1, reg->BitOffset); ACPI_MOVE_64_TO_64(&tmp, data + reg->Address); tmp &= mask; // shall be 'tmp &= ~mask;' here tmp |= __SHIFTIN(val, mask); ACPI_MOVE_64_TO_64(data + reg->Address, &tmp); } } ``` - I verify the code in my ARM64 pc with ubench before and after cpu-freq scale - My build is ``` ./build.sh -U -u -j12 -O /usr/obj.aarch64 -m evbarm -a aarch64 release ``` - My test platform is ``` arm64# uname -a NetBSD arm64 10.1_STABLE NetBSD 10.1_STABLE (GENERIC64) #14: Tue Jul 8 06:26:17 CST 2025 ``` - cpu-freq scale  - scale freq to 2500MHz  - scale freq to 625MHz