kvm: initialize qemu_host_page_size

There is a HOST_PAGE_ALIGN macro which makes sense for KVM accelerator
but it uses qemu_host_page_size/qemu_host_page_mask which initialized
for TCG only.

This moves qemu_host_page_size/qemu_host_page_mask initialization from
TCG's page_init() and adds a call for it from kvm_init().

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

include/exec/exec-all.h

diff --git a/include/exec/exec-all.h b/include/exec/exec-all.h
index ea90b64..3b03cbf 100644
--- a/include/exec/exec-all.h
+++ b/include/exec/exec-all.h
@@ -81,6 +81,7 @@
 int cpu_gen_code(CPUArchState *env, struct TranslationBlock *tb,
                  int *gen_code_size_ptr);
 bool cpu_restore_state(CPUArchState *env, uintptr_t searched_pc);
+void page_size_init(void);
 
 void QEMU_NORETURN cpu_resume_from_signal(CPUArchState *env1, void *puc);
 void QEMU_NORETURN cpu_io_recompile(CPUArchState *env, uintptr_t retaddr);