skiboot: Bump to 5.10-rc3

5.10-rc3 resolves two pflash issues, one related to race conditions in the
build system[0] and another to performing small erases[1]:

[0] 6d965ea72ad8 "pflash: Fix makefile dependency issue"
[1] ba540e0be90f "external/pflash: Fix erasing within a single erase block

Change-Id: Ibd43f67cd1222d81463ea796f8706e46dc3da041
Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
diff --git a/meta-openbmc-machines/meta-openpower/common/recipes-bsp/skiboot/skiboot.inc b/meta-openbmc-machines/meta-openpower/common/recipes-bsp/skiboot/skiboot.inc
index ea4adb9..1356479 100644
--- a/meta-openbmc-machines/meta-openpower/common/recipes-bsp/skiboot/skiboot.inc
+++ b/meta-openbmc-machines/meta-openpower/common/recipes-bsp/skiboot/skiboot.inc
@@ -8,8 +8,8 @@
 
 LIC_FILES_CHKSUM = "file://${S}/LICENCE;md5=3b83ef96387f14655fc854ddc3c6bd57"
 
-SRCREV = "e0ee24c27a172bcf482f6f2bc905e6211c134bcc"
-PV = "v5.9"
+SRCREV = "1d7da2e9b05b4995690abda54f853e0d84833af8"
+PV = "v5.10-rc3"
 
 S = "${WORKDIR}/git"