Bump skiboot to skiboot-5.6.0-87-ge835c2fb7ce1 for *ALL* platforms

As we enter the last 2 weeks before a new skiboot (4 for op-build),
bump skiboot for all POWER8 and POWER9 platforms

Changes for P9:
Cyril Bur (1):
      occ: Set return variable to correct value

Michael Ellerman (5):
      chip: Factor out chip inititialisation
      chip: Add support for discovering chips on mambo
      mambo: Create multiple chips when we have multiple CPUs
      core: Move enable_mambo_console() into chip initialisation
      chip: Print out when we initialise a chip

Oliver O'Halloran (1):
      core/fdt: Always add a reserve map

Russell Currey (6):
      gitignore: Add compile_commands.json
      phb4: Complete reset implementation
      phb4: Implement root port initialization
      phb4: Mask link down errors during reset
      phb4: Error clear implementation
      phb4: Error injection for config space

Stewart Smith (3):
      Add skiboot-5.4.5 release notes
      Add skiboot-5.4.6 release notes
      hw/ipmi/ipmi-sel: missing newline in prlog warning

Vasant Hegde (6):
      FSP/CHIPTOD: Return false in error path
      FSP/RTC: Fix possible FSP R/R issue in rtc write path
      FSP/RTC: Remove local fsp_in_reset variable
      FSP: Improve timeout message
      FSP: Set status field in response message for timed out message
      FSP/CONSOLE: Workaround for unresponsive ipmi daemon

ppaidipe@linux.vnet.ibm.com (1):
      hw/fsp/rtc: read/write cached rtc tod on fsp hir.

Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>
diff --git a/openpower/package/skiboot/Config.in b/openpower/package/skiboot/Config.in
index 0506983..fa8a8a3 100644
--- a/openpower/package/skiboot/Config.in
+++ b/openpower/package/skiboot/Config.in
@@ -31,7 +31,7 @@
 
 config BR2_SKIBOOT_VERSION
 	string
-	default "skiboot-5.6.0" if BR2_SKIBOOT_LATEST_VERSION
+	default "skiboot-5.6.0-87-ge835c2fb7ce1" if BR2_SKIBOOT_LATEST_VERSION
 	default BR2_SKIBOOT_CUSTOM_VERSION_VALUE \
 		if BR2_SKIBOOT_CUSTOM_VERSION