tpm_tis: make ilb_base_addr static

The pointer ilb_base_addr does not need to be in global scope, so make
it static.

Cleans up sparse warning:
"symbol 'ilb_base_addr' was not declared. Should it be static?"
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Reviewed-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@linux.intel.com>
Signed-off-by: James Morris <james.l.morris@oracle.com>

drivers/char/tpm/tpm_tis.c

@@ -138,7 +138,7 @@ static int check_acpi_tpm2(struct device *dev)
 #define LPC_CNTRL_REG_OFFSET            0x84
 #define LPC_CLKRUN_EN                   (1 << 2)
 
-void __iomem *ilb_base_addr;
+static void __iomem *ilb_base_addr;
 
 static inline bool is_bsw(void)
 {