tpm: tpm_tis_i2c: Tidy up delays

Use a _US suffix for microseconds and a _MS suffic for milliseconds. Move
all timeouts and delays into one place. Use mdelay() instead of udelay()
where appropriate.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Christophe Ricard <christophe-h.ricard@st.com>
Reviewed-by: Heiko Schocher <hs@denx.de>