LoongArch: Remove redundant "source drivers/firmware/Kconfig"

In drivers/Kconfig, drivers/firmware/Kconfig is sourced for all ports so
there is no need to source it in the port-specific Kconfig file.  And
sourcing it here also caused the "Firmware Drivers" menu appeared two
times: one in the "Device Drivers" menu, another in the toplevel menu.
This is really puzzling so remove it.

Reviewed-by: Randy Dunlap <[email protected]>
Signed-off-by: Xi Ruoyao <[email protected]>
Signed-off-by: Huacai Chen <[email protected]>

Author: xry111

arch/loongarch/Kconfig

@@ -662,5 +662,3 @@ source "kernel/power/Kconfig"
 source "drivers/acpi/Kconfig"
 
 endmenu
-
-source "drivers/firmware/Kconfig"