Enable sector erase function for selected ST M50 chips

Affected chips: M50FLW040A, M50FLW040B, M50FLW080A, M50FLW080B.

Corresponding to flashrom svn r1738.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
diff --git a/flashchips.c b/flashchips.c
index dbf01bc..05eb5b3 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -11022,7 +11022,7 @@
 					{4 * 1024, 16}, /* sector */
 					{4 * 1024, 16}, /* sector */
 				},
-				.block_erase = NULL,
+				.block_erase = erase_sector_stm50,
 			}, {
 				.eraseblocks = { {64 * 1024, 8}, },
 				.block_erase = erase_block_82802ab,
@@ -11055,7 +11055,7 @@
 					{64 * 1024, 5}, /* block */
 					{4 * 1024, 16}, /* sector */
 				},
-				.block_erase = NULL,
+				.block_erase = erase_sector_stm50,
 			}, {
 				.eraseblocks = { {64 * 1024, 8}, },
 				.block_erase = erase_block_82802ab,
@@ -11088,7 +11088,7 @@
 					{4 * 1024, 16}, /* sector */
 					{4 * 1024, 16}, /* sector */
 				},
-				.block_erase = NULL,
+				.block_erase = erase_sector_stm50,
 			}, {
 				.eraseblocks = { {64 * 1024, 16}, },
 				.block_erase = erase_block_82802ab,
@@ -11121,7 +11121,7 @@
 					{64 * 1024, 13}, /* block */
 					{4 * 1024, 16}, /* sector */
 				},
-				.block_erase = NULL,
+				.block_erase = erase_sector_stm50,
 			}, {
 				.eraseblocks = { {64 * 1024, 16}, },
 				.block_erase = erase_block_82802ab,