libflash: Fix parity calculation on ARM
libflash: Fix parity calculation on ARM

To calculate the ECC syndrome we need to calculate the parity of a 64bit
number. On non-powerpc platforms we use the gcc builtin function
__builtin_parityl() to do this calculation. This is broken on 32bit ARM
where sizeof(unsigned long) is four bytes. Using __builtin_parityll()
instead cures this.

Signed-off-by: Oliver O'Halloran <3dfaff8fa6ae977f042064a112a6aac576279b9b@gmail.com>
Signed-off-by: Stewart Smith <ec31ab75ddf977353c8f660f92ea8b23f64aef25@linux.vnet.ibm.com>

stewart-ibm/skiboot,open-power/skiboot,shenki/skiboot,qemu/skiboot,legoater/skiboot,open-power/skiboot,open-power/skiboot,qemu/skiboot,shenki/skiboot,qemu/skiboot,open-power/skiboot,legoater/skiboot,shenki/skiboot,open-power/skiboot,qemu/skiboot,shenki/skiboot,legoater/skiboot,qemu/skiboot,stewart-ibm/skiboot,legoater/skiboot,legoater/skiboot,shenki/skiboot,stewart-ibm/skiboot