firmware: qcom: scm: remove unneeded 'extern' specifiers

'extern' specifiers do nothing for function declarations. Remove them
from the private qcom-scm header.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Tested-by: Andrew Halaney <ahalaney@redhat.com> # sc8280xp-lenovo-thinkpad-x13s
Link: https://lore.kernel.org/r/20231017092732.19983-4-brgl@bgdev.pl
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

firmware: qcom: scm: add a missing forward declaration for struct device

We reference struct device in the private scm header but we neither
include linux/device.h nor forward declare it. Fix it.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Tested-by: Andrew Halaney <ahalaney@redhat.com> # sc8280xp-lenovo-thinkpad-x13s
Link: https://lore.kernel.org/r/20231017092732.19983-3-brgl@bgdev.pl
Signed-off-by: Bjorn Andersson <andersson@kernel.org>

firmware: qcom: move Qualcomm code into its own directory

We're getting more and more qcom specific .c files in drivers/firmware/
and about to get even more. Create a separate directory for Qualcomm
firmware drivers and move existing sources in there.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Acked-by: Elliot Berman <quic_eberman@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Maximilian Luz <luzmaximilian@gmail.com>
Tested-by: Andrew Halaney <ahalaney@redhat.com> # sc8280xp-lenovo-thinkpad-x13s
Link: https://lore.kernel.org/r/20231017092732.19983-2-brgl@bgdev.pl
Signed-off-by: Bjorn Andersson <andersson@kernel.org>