media: venus: hfi: Add 6xx AXI halt logic

This patch takes the downstream AXI halt routine and applies it when
IS_V6() is true.

bod: Converted to readl_poll_timeout()
     Removed poll timeout for LPI register, testing showed the value
     would always timeout and work, so the polling did nothing of value.

Signed-off-by: Dikshita Agarwal <dikshita@codeaurora.org>
Co-developed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Stanimir Varbanov <stanimir.varbanov@linaro.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>