wifi: mt76: mt7915: add missing MODULE_PARM_DESC

Add documentation for module_param so that they're visible with
modinfo command.
Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Signed-off-by: Felix Fietkau <nbd@nbd.name>

drivers/net/wireless/mediatek/mt76/mt7915/mmio.c

@@ -13,6 +13,7 @@
 
 static bool wed_enable;
 module_param(wed_enable, bool, 0644);
+MODULE_PARM_DESC(wed_enable, "Enable Wireless Ethernet Dispatch support");
 
 static const u32 mt7915_reg[] = {
 	[INT_SOURCE_CSR]		= 0xd7010,