block: drop dependency on ARCH_SHARK

With this machine deleted, there is no need to maintain the
MFM block driver for its hard disk either.

Cc: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/drivers/block/Kconfig b/drivers/block/Kconfig
index e07a5fd..e67fa16 100644
--- a/drivers/block/Kconfig
+++ b/drivers/block/Kconfig
@@ -505,7 +505,7 @@
 config BLK_DEV_HD
 	bool "Very old hard disk (MFM/RLL/IDE) driver"
 	depends on HAVE_IDE
-	depends on !ARM || ARCH_RPC || ARCH_SHARK || BROKEN
+	depends on !ARM || ARCH_RPC || BROKEN
 	help
 	  This is a very old hard disk driver that lacks the enhanced
 	  functionality of the newer ones.