drivers/i2c/tpm: Fix issues detected by checkpatch

Fix the following warnings detected by checkpatch.pl:

WARNING: Prefer 'unsigned int' to bare use of 'unsigned'
WARNING: braces {} are not necessary for single statement blocks
WARNING: Unnecessary parentheses - maybe == should be = ?
WARNING: line over 80 characters
WARNING: missing space after return type

TEST=Build and run on Galileo Gen2

Change-Id: I56f915f6c1975cce123fd38043bad2638717d88c
Signed-off-by: Lee Leahy <leroy.p.leahy@intel.com>
Reviewed-on: https://review.coreboot.org/18832
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

src/drivers/i2c/tpm/chip.h

@@ -4,7 +4,7 @@
 struct drivers_i2c_tpm_config {
 	const char *hid;	/* ACPI _HID (required) */
 	const char *desc;	/* Device Description */
-	unsigned uid;		/* ACPI _UID */
+	unsigned int uid;	/* ACPI _UID */
 	enum i2c_speed speed;	/* Bus speed in Hz, default is I2C_SPEED_FAST */
 	struct acpi_irq irq;	/* Interrupt */
 };