cmd: Convert existing long help messages to the new macro

- Generally we just drop the #ifdef CONFIG_SYS_LONGHELP and endif lines
and use U_BOOT_LONGHELP to declare the same variable name as before
- In a few places, either rename the variable to follow convention or
introduce the variable as it was being done inline before.

Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

cmd: event: Remove additional event description

The first name is taken from command name that's why shouldn't be listed in
help. The similar change was also done by commit a84d3b6c5634 ("cmd: pwm:
Remove additional pwm description").
Also remove additional spaces in help message.

Before:
event event list - list event spies

After:
event list - list event spies

Signed-off-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

event: Add a command

Add a command to show the available events.

Signed-off-by: Simon Glass <sjg@chromium.org>

cmd: event: Remove additional event description

The first name is taken from command name that's why shouldn't be listed in
help. The similar change was also done by commit a84d3b6c5634 ("cmd: pwm:
Remove additional pwm description").
Also remove additional spaces in help message.

Before:
event event list - list event spies

After:
event list - list event spies

Signed-off-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

event: Add a command

Add a command to show the available events.

Signed-off-by: Simon Glass <sjg@chromium.org>

event: Add a command

Add a command to show the available events.

Signed-off-by: Simon Glass <sjg@chromium.org>