UBUNTU: SAUCE: x86/speculation/taa: Call tsx_init()

The linux-4.14.y backport of upstream commit 95c5824f ("x86/cpu: Add
a "tsx=" cmdline option with TSX disabled by default") incorrectly
dropped the call to tsx_init(). Add the function call back to
identify_boot_cpu()

CVE-2019-11135
Suggested-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Signed-off-by: Tyler Hicks <tyhicks@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

arch/x86/kernel/cpu/common.c

@@ -1304,6 +1304,8 @@ void __init identify_boot_cpu(void)
 	enable_sep_cpu();
 #endif
 	cpu_detect_tlb(&boot_cpu_data);
+
+	tsx_init();
 }
 
 void identify_secondary_cpu(struct cpuinfo_x86 *c)