lguest: replace hypercall name LHCALL_SET_PMD with LHCALL_SET_PGD

replace LHCALL_SET_PMD with LHCALL_SET_PGD hypercall name
(That's really what it is, and the confusion gets worse with PAE support)

Signed-off-by: Matias Zabaljauregui <zabaljauregui@gmail.com>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Reported-by: Jeremy Fitzhardinge <jeremy@goop.org>
diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index 4f311e4..943a75e 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -535,7 +535,7 @@
 static void lguest_set_pmd(pmd_t *pmdp, pmd_t pmdval)
 {
 	native_set_pmd(pmdp, pmdval);
-	lazy_hcall2(LHCALL_SET_PMD, __pa(pmdp) & PAGE_MASK,
+	lazy_hcall2(LHCALL_SET_PGD, __pa(pmdp) & PAGE_MASK,
 		   (__pa(pmdp) & (PAGE_SIZE - 1)) / sizeof(pmd_t));
 }