arm64: compat: Workaround Neoverse-N1 #1542419 for compat user-space

arm64: compat: Workaround Neoverse-N1 #1542419 for compat user-space

[ Upstream commit 4c991f371442ac04d12a914c758f3ec8ba0d43b5 ]

Compat user-space is unable to perform ICIMVAU instructions from
user-space. Instead it uses a compat-syscall. Add the workaround for
Neoverse-N1 #1542419 to this code path.

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>