qcom-scm: Include <linux/err.h> header

Since commit e6f6d63ed14c ("drm/msm: add headless gpu device for imx5")
the DRM_MSM symbol can be selected by SOC_IMX5 causing the following
error when building imx_v6_v7_defconfig:

In file included from ../drivers/gpu/drm/msm/adreno/a5xx_gpu.c:17:0:
../include/linux/qcom_scm.h: In function 'qcom_scm_set_cold_boot_addr':
../include/linux/qcom_scm.h:73:10: error: 'ENODEV' undeclared (first use in this function)
return -ENODEV;

Include the <linux/err.h> header file to fix this problem.

Reported-by: kernelci.org bot <[e-mail]>
Fixes: e6f6d63ed14c ("drm/msm: add headless gpu device for imx5")
Signed-off-by: Fabio Estevam <[e-mail]>
Reviewed-by: Bjorn Andersson <[e-mail]>
Tested-by: Guenter Roeck <[e-mail]>
Signed-off-by: Andy Gross <[e-mail]>

include/linux/qcom_scm.h

···
 #ifndef __QCOM_SCM_H
 #define __QCOM_SCM_H
 
+#include <linux/err.h>
 #include <linux/types.h>
 #include <linux/cpumask.h>