soc: qcom: spm: add missing MODULE_DESCRIPTION()

make allmodconfig && make W=1 C=1 warns:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/soc/qcom/spm.o

Add the missing MODULE_DESCRIPTION(), using the same description as
the underlying QCOM_SPM Kconfig item.

Signed-off-by: Jeff Johnson <[e-mail]>
Reviewed-by: Dmitry Baryshkov <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Andersson <[e-mail]>

drivers/soc/qcom/spm.c

···
 }
 arch_initcall(qcom_spm_init);
 
+MODULE_DESCRIPTION("Qualcomm Subsystem Power Manager (SPM)");
 MODULE_LICENSE("GPL v2");