nanohub: drivers/lps22hb: remove unused macro from example

Commit 2243231c837aee03ebd80a202d00f896bc9a4494 ("nanohub:
drivers/lps22hb: Use dynamic I2C transfer buffer allocation") removes
the SPI part from the driver but left in the example the old macro
(now unused) to select between SPI and I2C.
Remove the unused macro from the example.
Moreover remove also some extra whitespace and simplify the comment
on top of the example.

Change-Id: I5451ca513f479f233f898095bd70b64245375ecc
Signed-off-by: Antonio Borneo <antonio.borneo@st.com>
1 file changed