lxc: associate armv7l as 32-bit variant of aarch64

AArch64 kernels are technically capable of running armv7l binaries.
Though some vendors disable this feature during kernel build, we
need to allow it in LXC.
Signed-off-by: NMatwey V. Kornilov <matwey.kornilov@gmail.com>

src/lxc/lxc_container.c

@@ -2285,6 +2285,8 @@ virArch lxcContainerGetAlt32bitArch(virArch arch)
         return VIR_ARCH_MIPS;
     if (arch == VIR_ARCH_MIPS64EL)
         return VIR_ARCH_MIPSEL;
+    if (arch == VIR_ARCH_AARCH64)
+        return VIR_ARCH_ARMV7L;
 
     return VIR_ARCH_NONE;
 }