[flashrom] Testing of EN25QH16

[Ben Johnson]

I have tested read, erase, and write on an Eon EN25QH16.
The program asked me to send a report, so here it is.

I was using the most recent git version, commit
4524e5f73eff4f3244fc94ce87039af5480a16bc.
I modified the makefile slightly to work with the current libftdi
(v1.2), but these changes were only for the pkg-config name and fixing
some include problems.

I used an FTDI FT2232H mini-module, configured to be self-powered.
The target was mounted on a small breakout board with a 47nF bypass
capacitor and connected to the mini-module with individual jumper
wires about six inches long.
The HOLD# pin was tied high at the device.  The WP# was tied low/high
at the device as described below.

The logs are (in order of operations):
log_read: Reading before any erase or write operations were attempted.
log_erase_wp: Erasing with WP# tied low (failed, and the chip contents
were retained).
At this point, I tied WP# high.
log_erase: Erasing (succeeded).
log_read_after_erase: Reading after erasing but before writing.  The
data was verified to be all FF's.
log_write: Writing (succeeded with verification).
log_read_after_write: Reading after the erase and write operations.
The data read here was verified to be correct.
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