scripts/checkstack.pl: remove blackfin support

The Blackfin port has been removed from the kernel, also remove the
blackfin specific bits from the checkstack.pl script.
Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

scripts/checkstack.pl

@@ -98,9 +98,6 @@ my (@stack, $re, $dre, $x, $xs, $funcre);
 		#     pair for larger users. -- PFM.
 		#a00048e0:       d4fc40f0        addi.l  r15,-240,r15
 		$re = qr/.*addi\.l.*r15,-(([0-9]{2}|[3-9])[0-9]{2}),r15/o;
-	} elsif ($arch =~ /^blackfin$/) {
-		#   0:   00 e8 38 01     LINK 0x4e0;
-		$re = qr/.*[[:space:]]LINK[[:space:]]*(0x$x{1,8})/o;
 	} elsif ($arch eq 'sparc' || $arch eq 'sparc64') {
 		# f0019d10:       9d e3 bf 90     save  %sp, -112, %sp
 		$re = qr/.*save.*%sp, -(([0-9]{2}|[3-9])[0-9]{2}), %sp/o;