Merge panda_a2 and panda SPEC (fix #505, fix #506)

There is no obvious reason for having two different SPEC variables, definitions,
and pathes for the Pandaboard platform. It even lead to problems regarding the
omap4 framebuffer driver (look at issue #505 and #506).

tool/create_builddir

@@ -27,7 +27,7 @@ usage:
 	@echo "                  'nova_x86_64'"
 	@echo "                  'codezero_vpb926'"
 	@echo "                  'mb_s3a_starter_kit'"
-	@echo "                  'hw_panda_a2'"
+	@echo "                  'hw_panda'"
 	@echo "                  'hw_vea9x4'"
 	@echo "                  'hw_pbxa9'"
 	@echo "                  'foc_x86_32'"
@@ -132,7 +132,7 @@ endif
 #
 # Add ARM drivers repositories to ARM build directories
 #
-ifeq ($(filter-out foc_panda,$(PLATFORM)),)
+ifeq ($(filter-out foc_panda hw_panda,$(PLATFORM)),)
 $(BUILD_DIR)/etc/build.conf::
 	@cat $(BUILD_CONF).drivers_arm >> $@
 endif
@@ -186,8 +186,8 @@ hw_pbxa9::
 hw_vea9x4::
 	@echo "SPECS = genode hw_vea9x4" > $(BUILD_DIR)/etc/specs.conf
 
-hw_panda_a2::
-	@echo "SPECS = genode hw_panda_a2" > $(BUILD_DIR)/etc/specs.conf
+hw_panda::
+	@echo "SPECS = genode hw_panda" > $(BUILD_DIR)/etc/specs.conf
 
 lx_hybrid_x86::
 	@echo "CROSS_DEV_PREFIX =" > $(BUILD_DIR)/etc/tools.conf