mfd: tc6387xb: Remove unnecessary braces and correct style warnings

mfd: tc6387xb: Remove unnecessary braces and correct style warnings

This is part of an effort to clean-up the MFD subsystem.

WARNING: braces {} are not necessary for single statement blocks
+       if (!iomem) {
+               return -EINVAL;
+       }

WARNING: sizeof *tc6387xb should be sizeof(*tc6387xb)
+       tc6387xb = kzalloc(sizeof *tc6387xb, GFP_KERNEL);

WARNING: Prefer [subsystem eg: netdev]_info([subsystem]dev, ... then dev_info(dev, ... then pr_info(...  to printk(KERN_INFO ...
+       printk(KERN_INFO "Toshiba tc6387xb initialised\n");

total: 0 errors, 3 warnings, 242 lines checked

Signed-off-by: Lee Jones <lee.jones@linaro.org>