uapi: net_dropmon: drop unused is_drop_point_hw macro

Commit 4ea7e38696c7 ("dropmon: add ability to detect when hardware
drops rx packets") introduced is_drop_point_hw, but the symbol was
never referenced anywhere in the kernel tree and is currently not used
by dropwatch. I could not find, to the best of my abilities, a current
out-of-tree user of this macro.

The definition also contains a syntax error in its for-loop, so any
project that tried to compile against it would fail. Removing the
macro therefore eliminates dead code without breaking existing
users.

Signed-off-by: RubenKelevra <[e-mail]>
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

include/uapi/linux/net_dropmon.h

···
 	__u32 count;
 };
 
-#define is_drop_point_hw(x) do {\
-	int ____i, ____j;\
-	for (____i = 0; ____i < 8; i ____i++)\
-		____j |= x[____i];\
-	____j;\
-} while (0)
-
 #define NET_DM_CFG_VERSION  0
 #define NET_DM_CFG_ALERT_COUNT  1
 #define NET_DM_CFG_ALERT_DELAY 2