x86/paravirt: Remove unused paravirt bits

The macros ENABLE_INTERRUPTS_SYSEXIT, GET_CR0_INTO_EAX and
PARAVIRT_ADJUST_EXCEPTION_FRAME are used nowhere.

Remove their definitions.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: xen-devel@lists.xenproject.org
Cc: virtualization@lists.linux-foundation.org
Cc: akataria@vmware.com
Cc: rusty@rustcorp.com.au
Cc: boris.ostrovsky@oracle.com
Cc: hpa@zytor.com
Link: https://lkml.kernel.org/r/20180828074026.820-10-jgross@suse.com

arch/x86/include/asm/paravirt.h

@@ -887,14 +887,7 @@ extern void default_banner(void);
 		  call PARA_INDIRECT(pv_ops+PV_IRQ_irq_enable);		\
 		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 
-#ifdef CONFIG_X86_32
-#define GET_CR0_INTO_EAX				\
-	push %ecx; push %edx;				\
-	ANNOTATE_RETPOLINE_SAFE;				\
-	call PARA_INDIRECT(pv_ops+PV_CPU_read_cr0);	\
-	pop %edx; pop %ecx
-#else	/* !CONFIG_X86_32 */
-
+#ifdef CONFIG_X86_64
 /*
  * If swapgs is used while the userspace stack is still current,
  * there's no way to call a pvop.  The PV replacement *must* be