hv: pgtable: fix 'Use of function like macro'

Convert HPA2HVA, HVA2HPA, GPA2HVA and HVA2GPA to inline functions.

v1 -> v2:
 * Modify the following statement.
   rsdp = biosacpi_search_rsdp((char *)hpa2hva((uint64_t)(*addr << 4)),
                                                                0x400);
   Instead of "(uint64_t)(*addr << 4)", "(uint64_t)(*addr) << 4U" would
   be clearer.

Tracked-On: #861
Signed-off-by: Shiqing Gao <shiqing.gao@intel.com>
Reviewed-by: Junjie Mao <junjie.mao@intel.com>

hypervisor/arch/x86/ioapic.c

@@ -86,7 +86,7 @@ static void *map_ioapic(uint64_t ioapic_paddr)
 	/* At some point we may need to translate this paddr to a vaddr.
 	 * 1:1 mapping for now.
 	 */
-	return HPA2HVA(ioapic_paddr);
+	return hpa2hva(ioapic_paddr);
 }
 
 static inline uint32_t