Clean up QEMU_TARGETS variable

Build QEMU only for relevant targets to speed up compilation process.

Signed-off-by: Konstantin Aladyshev <aladyshev22@gmail.com>
Change-Id: I67c86d6c8fdd2b4969c35c98bec9d5d2342bbef6
diff --git a/meta-phosphor/conf/distro/include/phosphor-base.inc b/meta-phosphor/conf/distro/include/phosphor-base.inc
index f5feca1..1d8cc4a 100644
--- a/meta-phosphor/conf/distro/include/phosphor-base.inc
+++ b/meta-phosphor/conf/distro/include/phosphor-base.inc
@@ -12,7 +12,7 @@
 
 TCLIBCAPPEND = ""
 
-QEMU_TARGETS ?= "arm aarch64 i386 mips mipsel mips64 mips64el nios2 ppc riscv32 riscv64 x86_64"
+QEMU_TARGETS ?= "arm aarch64 i386 riscv32 riscv64 x86_64"
 
 PREMIRRORS ??= "\
 bzr://.*/.*   http://downloads.yoctoproject.org/mirror/sources/ \n \