Remove DAIF bits handling macros

These macros are unused and redundant with other CPU system registers
functions.

Moreover enable_serror() function implementation may not reach its purpose
because it does not handle the value of SCR_EL3.EA.

Signed-off-by: Gerald Lejeune <gerald.lejeune@st.com>

include/lib/aarch64/arch_helpers.h

@@ -168,15 +168,6 @@ void disable_mmu_icache_el3(void);
 DEFINE_SYSREG_WRITE_CONST_FUNC(daifset)
 DEFINE_SYSREG_WRITE_CONST_FUNC(daifclr)
 
-#define enable_irq()			write_daifclr(DAIF_IRQ_BIT)
-#define enable_fiq()			write_daifclr(DAIF_FIQ_BIT)
-#define enable_serror()			write_daifclr(DAIF_ABT_BIT)
-#define enable_debug_exceptions()	write_daifclr(DAIF_DBG_BIT)
-#define disable_irq()			write_daifset(DAIF_IRQ_BIT)
-#define disable_fiq()			write_daifset(DAIF_FIQ_BIT)
-#define disable_serror()		write_daifset(DAIF_ABT_BIT)
-#define disable_debug_exceptions()	write_daifset(DAIF_DBG_BIT)
-
 DEFINE_SYSREG_READ_FUNC(par_el1)
 DEFINE_SYSREG_READ_FUNC(id_pfr1_el1)
 DEFINE_SYSREG_READ_FUNC(id_aa64pfr0_el1)