soc: qcom: cmd-db: Fix compilation error when CMD_DB is disabled

If CONFIG_QCOM_COMMAND_DB=n the following compilation errors will be
seen. Fix this by including the appropriate linux headers.

./include/soc/qcom/cmd-db.h: In function ‘cmd_db_read_aux_data’:
./include/soc/qcom/cmd-db.h: error: implicit declaration of function ‘ERR_PTR’;

Change-Id: I76ed6230b00f88cefbb78e5f2ee4a534316078d7
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Signed-off-by: Sibi Sankar <sibis@codeaurora.org>
Link: https://lore.kernel.org/r/20200227125615.4727-1-sibis@codeaurora.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Git-commit: 7ad18bb5c2c4bd50c8b83d375ee19be992022cf3
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Signed-off-by: Tushar Nimkar <tnimkar@codeaurora.org>