i2c: rzv2m: Replace lowercase macros with static inline functions

Convert macros bit_setl and bit_clrl with static inline functions
as normally we'd put macro names in all uppercase.

Reported-by: Pavel Machek <pavel@denx.de>
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>