include: linux: Import hw_bitfield.h from Linux v6.18

Hardware of various vendors, but very notably Rockchip, often uses
32-bit registers where the upper 16-bit half of the register is a
write-enable mask for the lower half.

Add hw_bitfield.h with two macros: FIELD_PREP_WM16, and
FIELD_PREP_WM16_CONST. The latter is a version that can be used in
initializers, like FIELD_PREP_CONST.

Import hw_bitfield.h from Linux commit 21368fcbb124 ("bitmap: introduce
hardware-specific bitfield operations"), first introduced in v6.18-rc1.

This contains two changes compared to the Linux version:
- include of linux/limit.h was dropped
- use of const_true() in FIELD_PREP_WM16_CONST() was dropped

Signed-off-by: Jonas Karlman <[email protected]>
Acked-by: Quentin Schulz <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Quentin Schulz <[email protected]>

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