spi25.c: Make some local member fn static

BUG=b:170189476
BRANCH=none
TEST=builds

Signed-off-by: Edward O'Callaghan <quasisec@google.com>
Change-Id: I54d9b8387807638f895fa5e029194e58e1c93c3b
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/flashrom/+/2466019
Tested-by: Edward O'Callaghan <quasisec@chromium.org>
Commit-Queue: Edward O'Callaghan <quasisec@chromium.org>
Auto-Submit: Edward O'Callaghan <quasisec@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
diff --git a/spi25.c b/spi25.c
index 7f02dd9..21b4e12 100644
--- a/spi25.c
+++ b/spi25.c
@@ -442,19 +442,19 @@
 	return result ? result : status;
 }
 
-int spi_chip_erase_60(struct flashctx *flash)
+static int spi_chip_erase_60(struct flashctx *flash)
 {
 	/* This usually takes 1-85s, so wait in 1s steps. */
 	return spi_simple_write_cmd(flash, 0x60, 1000 * 1000);
 }
 
-int spi_chip_erase_62(struct flashctx *flash)
+static int spi_chip_erase_62(struct flashctx *flash)
 {
 	/* This usually takes 2-5s, so wait in 100ms steps. */
 	return spi_simple_write_cmd(flash, 0x62, 100 * 1000);
 }
 
-int spi_chip_erase_c7(struct flashctx *flash)
+static int spi_chip_erase_c7(struct flashctx *flash)
 {
 	/* This usually takes 1-85s, so wait in 1s steps. */
 	return spi_simple_write_cmd(flash, 0xc7, 1000 * 1000);