Switch SST49LF004A/B to block erase, remove the hack which simulated (unsupported) chip erase

Annotate SST49LF004B quirks for TBL#.

Add TEST_OK_PRW which is useful when a PREW chip gets a new erase
routine.

Change a few erase function prototypes to use unsigned int instead of
int.

Corresponding to flashrom svn r731.

Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>
Acked-by: Luc Verhaegen <libv@skynet.be>
diff --git a/sst_fwhub.c b/sst_fwhub.c
index e7ae9e9..ed45407 100644
--- a/sst_fwhub.c
+++ b/sst_fwhub.c
@@ -94,7 +94,7 @@
 	return 1;
 }
 
-int erase_sst_fwhub_block(struct flashchip *flash, int offset, int page_size)
+int erase_sst_fwhub_block(struct flashchip *flash, unsigned int offset, unsigned int page_size)
 {
 	uint8_t blockstatus = clear_sst_fwhub_block_lock(flash, offset);