x86/umip: Print UMIP line only once

... instead of issuing it per CPU and flooding dmesg unnecessarily.
Streamline the formulation, while at it.
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20181127205936.30331-1-bp@alien8.de

arch/x86/kernel/cpu/common.c

@@ -353,7 +353,7 @@ static __always_inline void setup_umip(struct cpuinfo_x86 *c)
 
 	cr4_set_bits(X86_CR4_UMIP);
 
-	pr_info("x86/cpu: Activated the Intel User Mode Instruction Prevention (UMIP) CPU feature\n");
+	pr_info_once("x86/cpu: Intel User Mode Instruction Prevention (UMIP) activated\n");
 
 	return;