agp: uninorth: add missing MODULE_DESCRIPTION() macro

With ARCH=powerpc, make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/char/agp/uninorth-agp.o

Add the missing invocation of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Reviewed-by: Jeffrey Hugo <quic_jhugo@quicinc.com>
Link: https://lore.kernel.org/r/20240615-md-powerpc-drivers-char-agp-v1-1-b79bfd07da42@quicinc.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/char/agp/uninorth-agp.c

@@ -726,4 +726,5 @@ MODULE_PARM_DESC(aperture,
 		 "\t\tDefault: " DEFAULT_APERTURE_STRING "M");
 
 MODULE_AUTHOR("Ben Herrenschmidt & Paul Mackerras");
+MODULE_DESCRIPTION("Apple UniNorth & U3 AGP support");
 MODULE_LICENSE("GPL");