libs: openblas: use GENERIC target for MIPS64 archs and as default

The GENERIC target for OpenBLAS seems good enough for most configs, so try
to use it for MIPS64 and as default for other archs.
This was already being used for x86{_64} archs.

Signed-off-by: Alexandru Ardelean <ardeleanalex@gmail.com>

libs/openblas/Makefile

@@ -49,6 +49,9 @@ endef
 OPENBLAS_TARGET=$(call qstrip,$(CONFIG_OPENBLAS_TARGET_OVERRIDE))
 
 ifeq ($(OPENBLAS_TARGET),)
+# initialize to GENERIC as default
+OPENBLAS_TARGET:=GENERIC
+
 ifeq ($(ARCH),aarch64)
   OPENBLAS_TARGET:=ARMV8
 else ifeq ($(ARCH),arm)
@@ -59,14 +62,6 @@ else ifeq ($(ARCH),mipsel)
   OPENBLAS_TARGET:=MIPS24K
 else ifeq ($(ARCH),powerpc)
   OPENBLAS_TARGET:=PPC440
-else ifeq ($(ARCH),mips64)
-  OPENBLAS_TARGET:=I6400
-else ifeq ($(ARCH),mips64el)
-  OPENBLAS_TARGET:=I6400
-else ifeq ($(ARCH),i386)
-  OPENBLAS_TARGET:=GENERIC
-else ifeq ($(ARCH),x86_64)
-  OPENBLAS_TARGET:=GENERIC
 endif
 endif # ifeq ($(OPENBLAS_TARGET),)