staging: r8188eu: remove local BIT macro

staging: r8188eu: remove local BIT macro

The r8188eu driver defines a local BIT(x) macro. Remove this local macro
and use the one from include/linux/bits.h.

The global BIT macro returns an unsigned long value, the removed local
BIT macro used a signed int.

DYNAMIC_BB_DYNAMIC_TXPWR is defined as BIT(2), ~DYNAMIC_BB_DYNAMIC_TXPWR
is passed to Switch_DM_Func as a u32 parameter. We need a cast in this
case as ~DYNAMIC_BB_DYNAMIC_TXPWR is a 64-bit value on x86_64 systems.

Reviewed-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Martin Kaiser <martin@kaiser.cx>
Link: https://lore.kernel.org/r/20220319180342.3143734-1-martin@kaiser.cx
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>