powerpc/32: Remove the 'nobats' kernel parameter

[ Upstream commit 1ce84497 ]

Mapping without BATs doesn't bring any added value to the user.

Remove that option.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6977314c823cfb728bc0273cea634b41807bfb64.1655202721.git.christophe.leroy@csgroup.eu


Stable-dep-of: f9f2bff6 ("powerpc/8xx: Fix initial memory mapping")
Signed-off-by: Sasha Levin <sashal@kernel.org>