agp: add missing MODULE_DESCRIPTION() macros

make allmodconfig && make W=1 C=1 reports:
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/char/agp/amd64-agp.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/char/agp/intel-agp.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/char/agp/intel-gtt.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/char/agp/sis-agp.o
WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/char/agp/via-agp.o

Add the missing invocations of the MODULE_DESCRIPTION() macro.
Signed-off-by: Jeff Johnson <quic_jjohnson@quicinc.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240603-md-agp-v1-1-9a1582114ced@quicinc.com

drivers/char/agp/amd64-agp.c

@@ -802,4 +802,5 @@ module_exit(agp_amd64_cleanup);
 
 MODULE_AUTHOR("Dave Jones, Andi Kleen");
 module_param(agp_try_unsupported, bool, 0);
+MODULE_DESCRIPTION("GART driver for the AMD Opteron/Athlon64 on-CPU northbridge");
 MODULE_LICENSE("GPL");

drivers/char/agp/intel-agp.c

@@ -920,4 +920,5 @@ module_init(agp_intel_init);
 module_exit(agp_intel_cleanup);
 
 MODULE_AUTHOR("Dave Jones, Various @Intel");
+MODULE_DESCRIPTION("Intel AGPGART routines");
 MODULE_LICENSE("GPL and additional rights");

drivers/char/agp/intel-gtt.c

@@ -1461,4 +1461,5 @@ void intel_gmch_remove(void)
 EXPORT_SYMBOL(intel_gmch_remove);
 
 MODULE_AUTHOR("Dave Jones, Various @Intel");
+MODULE_DESCRIPTION("Intel GTT (Graphics Translation Table) routines");
 MODULE_LICENSE("GPL and additional rights");

drivers/char/agp/sis-agp.c

@@ -433,4 +433,5 @@ module_param(agp_sis_force_delay, bool, 0);
 MODULE_PARM_DESC(agp_sis_force_delay,"forces sis delay hack");
 module_param(agp_sis_agp_spec, int, 0);
 MODULE_PARM_DESC(agp_sis_agp_spec,"0=force sis init, 1=force generic agp3 init, default: autodetect");
+MODULE_DESCRIPTION("SiS AGPGART routines");
 MODULE_LICENSE("GPL and additional rights");

drivers/char/agp/via-agp.c

@@ -575,5 +575,6 @@ static void __exit agp_via_cleanup(void)
 module_init(agp_via_init);
 module_exit(agp_via_cleanup);
 
+MODULE_DESCRIPTION("VIA AGPGART routines");
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Dave Jones");