remove dead code in io.h

remove thess APIs:
   set64
   set32
   set16
   set8

Tracked-On: #4958
Signed-off-by: Mingqiang Chi <mingqiang.chi@intel.com>

hypervisor/include/arch/x86/io.h

@@ -166,64 +166,4 @@ static inline uint8_t mmio_read8(const void *addr)
 	return *((volatile const uint8_t *)addr);
 }
 
-/** Reads a 64 Bit memory mapped IO register, mask it and write it back into
- *  memory mapped IO register.
- *
- * @param addr    The address of the memory mapped IO register.
- * @param mask    The mask to apply to the value read.
- * @param value   The 64 bit value to write.
- */
-static inline void set64(void *addr, uint64_t mask, uint64_t value)
-{
-	uint64_t temp_val;
-
-	temp_val = mmio_read64(addr);
-	mmio_write64((temp_val & ~mask) | value, addr);
-}
-
-/** Reads a 32 Bit memory mapped IO register, mask it and write it back into
- *  memory mapped IO register.
- *
- * @param addr    The address of the memory mapped IO register.
- * @param mask    The mask to apply to the value read.
- * @param value   The 32 bit value to write.
- */
-static inline void set32(void *addr, uint32_t mask, uint32_t value)
-{
-	uint32_t temp_val;
-
-	temp_val = mmio_read32(addr);
-	mmio_write32((temp_val & ~mask) | value, addr);
-}
-
-/** Reads a 16 Bit memory mapped IO register, mask it and write it back into
- *  memory mapped IO register.
- *
- * @param addr    The address of the memory mapped IO register.
- * @param mask    The mask to apply to the value read.
- * @param value   The 16 bit value to write.
- */
-static inline void set16(void *addr, uint16_t mask, uint16_t value)
-{
-	uint16_t temp_val;
-
-	temp_val = mmio_read16(addr);
-	mmio_write16((temp_val & ~mask) | value, addr);
-}
-
-/** Reads a 8 Bit memory mapped IO register, mask it and write it back into
- *  memory mapped IO register.
- *
- * @param addr    The address of the memory mapped IO register.
- * @param mask    The mask to apply to the value read.
- * @param value   The 8 bit value to write.
- */
-static inline void set8(void *addr, uint8_t mask, uint8_t value)
-{
-	uint8_t temp_val;
-
-	temp_val = mmio_read8(addr);
-	mmio_write8((temp_val & ~mask) | value, addr);
-}
-
 #endif /* _IO_H defined */