KVM: selftests: Remove unnecessary defines

#define KVM_DEV_PATH		"/dev/kvm"

#ifndef BITS_PER_BYTE

#define BITS_PER_BYTE		8

#endif

#ifndef BITS_PER_LONG

#define BITS_PER_LONG		(BITS_PER_BYTE * sizeof(long))

#endif

#define DIV_ROUND_UP(n, d)	(((n) + (d) - 1) / (d))

#define BITS_TO_LONGS(nr)	DIV_ROUND_UP(nr, BITS_PER_LONG)

struct userspace_mem_region {

	struct userspace_mem_region *next, *prev;

	struct kvm_userspace_memory_region region;