Remove support for POWER8 targets

* Remove configurations and packages related to POWER8 machines
* Adjust documentation where relevant
* Move 'opal_defconfig' to use Power9

Signed-off-by: Nick Bofferding <bofferdn@us.ibm.com>
Signed-off-by: Klaus Heinrich Kiwi <klaus@linux.vnet.ibm.com>
diff --git a/openpower/package/hostboot-binaries/hostboot_binaries.mk b/openpower/package/hostboot-binaries/hostboot_binaries.mk
index 658c281..a7649c8 100644
--- a/openpower/package/hostboot-binaries/hostboot_binaries.mk
+++ b/openpower/package/hostboot-binaries/hostboot_binaries.mk
@@ -14,25 +14,11 @@
 HOSTBOOT_BINARIES_INSTALL_IMAGES = YES
 HOSTBOOT_BINARIES_INSTALL_TARGET = NO
 
-# Creating Install Commands specific to P8 and P9
-# -- P8 does not need the nimbus and axone ring files
+# Creating Install Commands specific to P9
 # -- P9 does not need the SBE files ('sbe' package is used in P9)
 # -- P9 uses the 'hcode' package to build the BR2_HOSTBOOT_BINARY_WINK_FILENAME
 
 ###################################
-# P8:
-ifeq ($(BR2_OPENPOWER_POWER8),y)
-define HOSTBOOT_BINARIES_INSTALL_IMAGES_CMDS
-     $(INSTALL) -D $(@D)/cvpd.bin  $(STAGING_DIR)/hostboot_binaries/cvpd.bin
-     $(INSTALL) -D $(@D)/$(BR2_HOSTBOOT_BINARY_WINK_FILENAME) $(STAGING_DIR)/hostboot_binaries/
-     $(INSTALL) -D $(@D)/$(BR2_HOSTBOOT_BINARY_IONV_FILENAME)  $(STAGING_DIR)/hostboot_binaries/
-     $(INSTALL) -D $(@D)/$(BR2_HOSTBOOT_BINARY_SBEC_FILENAME) $(STAGING_DIR)/hostboot_binaries/
-     $(INSTALL) -D $(@D)/$(BR2_HOSTBOOT_BINARY_SBE_FILENAME)  $(STAGING_DIR)/hostboot_binaries/
-     $(INSTALL) -D $(@D)/gpu_gpe1.bin  $(STAGING_DIR)/hostboot_binaries/gpu_gpe1.bin
-endef
-endif
-
-###################################
 # P9:
 ifeq ($(BR2_OPENPOWER_POWER9),y)