libroot/riscv64: minor riscv64 fixes

Change-Id: I96b604aabe18307d7376473b8d9cd50eccb537d1
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4709
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

libroot/os: implement arch-specific parts for riscv64

Change-Id: Idb6920b4c98a579a184e6a7e1976f2d8c7618dba
Reviewed-on: https://review.haiku-os.org/c/haiku/+/3983
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>

riscv64: Add missing linker scripts, fix some kernel dependencies

Change-Id: Ic63b0bbdddda629bb9bc76017a806746c983023e

libroot/riscv64: Fix build. Add MIT optimized bswap from rv8

Change-Id: I4d0e1ec34d1568594cac0f7378f87852c997ab81
Reviewed-on: https://review.haiku-os.org/c/haiku/+/2166
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

libroot/os: Fix missing time funcs on riscv64

Change-Id: I291ebc949d63860e20eb609e4d3d2f600309d4e9
Reviewed-on: https://review.haiku-os.org/c/1553
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>

riscv64: Fill in more bulk architecture items around libroot/kernel

Change-Id: Ia2a86d8814d06950ea2d2d19d966c642d26f81d6
Reviewed-on: https://review.haiku-os.org/c/1302
Reviewed-by: Alex von Gluck IV <kallisti5@unixzen.com>
Reviewed-by: Adrien Destugues <pulkomandy@gmail.com>