hv: replace CPU_PAGE_SIZE with PAGE_SIZE

replace CPU_PAGE_SIZE with PAGE_SIZE
These two MACROs are duplicated and PAGE_SIZE is a more reasonable name.

Tracked-On: #861
Signed-off-by: Shiqing Gao <shiqing.gao@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/include/arch/x86/page.h

@@ -28,6 +28,8 @@
 #define TRUSTY_PGTABLE_PAGE_NUM(size)	\
 (TRUSTY_PML4_PAGE_NUM(size) + TRUSTY_PDPT_PAGE_NUM(size) + TRUSTY_PD_PAGE_NUM(size) + TRUSTY_PT_PAGE_NUM(size))
 
+struct acrn_vm;
+
 struct page {
 	uint8_t contents[PAGE_SIZE];
 } __aligned(PAGE_SIZE);