Don't build or use qt_convert_rgb888_to_rgb32_neon on ARM64/AArch64
The assembly code doesn't build on that architecture yet:
qimage_neon.cpp:78:17: error: vector register expected
"vld3.8 { d0, d1, d2 }, [%[SRC]] !\n\t"
^
<inline asm>:1:15: note: instantiated into assembly here
vld3.8 { d0, d1, d2 }, [x1] !
^
qimage_neon.cpp:78:57: error: unrecognized instruction mnemonic
"vld3.8 { d0, d1, d2 }, [%[SRC]] !\n\t"
^
<inline asm>:2:2: note: instantiated into assembly here
vswp d0, d2
^
qimage_neon.cpp:79:31: error: vector register expected
"vswp d0, d2\n\t"
^
<inline asm>:3:15: note: instantiated into assembly here
vst4.8 { d0, d1, d2, d3 }, [x8,:64] !
^
Change-Id: I8fe93b3940d971c0aed5973fe6e1a5e2f362df3c
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>