package/qemu: add support for PPC970 processors

PPC970 processors are well supported by the QEMU pseries and macbook
machines. The latest debian 11 (big endian) runs with SMP. Re-add
support.

Fixes: efc67deef38c ("qemu: remove support for some PowerPC processors in host qemu")
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/qemu/Config.in.host

@@ -22,7 +22,7 @@ config BR2_PACKAGE_HOST_QEMU_ARCH_SUPPORTS
 	default y if BR2_xtensa
 	default y if BR2_x86_64
 	depends on !BR2_x86_steamroller && !BR2_x86_core_avx2
-	depends on !BR2_powerpc_620 && !BR2_powerpc_630 && !BR2_powerpc_970
+	depends on !BR2_powerpc_620 && !BR2_powerpc_630
 
 config BR2_PACKAGE_HOST_QEMU_SYSTEM_ARCH_SUPPORTS
 	bool