Combine block_erase*_en29lv640b and block_erase*_m29f400bt respectively

This patch combines two identical block and chip erase functions respectively:
 - Merge block_erase_m29f400bt and block_erase_en29lv640b into
   erase_block_shifted_jedec.
 - Merge block_erase_chip_m29f400bt and block_erase_chip_en29lv640b into
   erase_chip_block_shifted_jedec.

Leave their implementations in en29lv640b.c for now.

Corresponding to flashrom svn r1808.

Signed-off-by: Stefan Tauner <stefan.tauner@alumni.tuwien.ac.at>
Acked-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
diff --git a/en29lv640b.c b/en29lv640b.c
index 110aa18..a274f62 100644
--- a/en29lv640b.c
+++ b/en29lv640b.c
@@ -86,7 +86,7 @@
 	return 0;
 }
 
-int erase_en29lv640b(struct flashctx *flash)
+static int erase_chip_shifted_jedec(struct flashctx *flash)
 {
 	chipaddr bios = flash->virtual_memory;
 
@@ -105,8 +105,7 @@
 	return 0;
 }
 
-int block_erase_en29lv640b(struct flashctx *flash, unsigned int start,
-			   unsigned int len)
+int erase_block_shifted_jedec(struct flashctx *flash, unsigned int start, unsigned int len)
 {
 	chipaddr bios = flash->virtual_memory;
 	chipaddr dst = bios + start;
@@ -126,12 +125,11 @@
 	return 0;
 }
 
-int block_erase_chip_en29lv640b(struct flashctx *flash, unsigned int address,
-			        unsigned int blocklen)
+int erase_chip_block_shifted_jedec(struct flashctx *flash, unsigned int address, unsigned int blocklen)
 {
 	if ((address != 0) || (blocklen != flash->chip->total_size * 1024)) {
 		msg_cerr("%s called with incorrect arguments\n", __func__);
 		return -1;
 	}
-	return erase_en29lv640b(flash);
+	return erase_chip_shifted_jedec(flash);
 }