orinoco: remove unused array encaps_hdr and macro ENCAPS_OVERHEAD

Array encaps_hdr and macro ENCAPS_OVERHEAD are declared but are
not being used, hence they are redundant and can be removed.

Cleans up clang warning:
warning: 'encaps_hdr' defined but not used [-Wunused-const-variable=]
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

drivers/net/wireless/intersil/orinoco/orinoco_usb.c

@@ -73,10 +73,6 @@
 #define URB_ASYNC_UNLINK 0
 #endif
 
-/* 802.2 LLC/SNAP header used for Ethernet encapsulation over 802.11 */
-static const u8 encaps_hdr[] = {0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00};
-#define ENCAPS_OVERHEAD		(sizeof(encaps_hdr) + 2)
-
 struct header_struct {
 	/* 802.3 */
 	u8 dest[ETH_ALEN];