libc/stdlib: Error Fix

Approved-by: Gregory Nutt <gnutt@nuttx.org>

1.Fix an error in mkstemp() the could result in an infinite loop.
2.Fix for wrong output in some cases.
For Example:
 1) input: "FILEXX"
    output: "FILE00" and repeats same output for further invocations of mkstemp().
            But, the ouput has to be FILE01, FILE02, ...., FILEZZ.
 2)input: "FILEXXXXXX"
   output: "FILE100000", for next invocation "FILE200000" and so on
           But it's good, if the ouput goes like FILE000001, FILE000002, ..., FILE000101, ...

Signed-off-by: Lokesh B V <lokeshbv333@gmail.com>

USB MSC: Add missing logic to define endpoints.  The composite changes broke the the non-composite, USB MSC only case because it omitted the critical setup when USB MSC was not part of the composite.

USB device:  Rename usbdev_description_s to usbdev_devinfo_s to avoid any more confusion of naming with device descriptions in the future.  Instances of usbdev_devinfo_s are now called devinfo vs devdesc when is a bad naming collision.

Libc math: Error fixes in modf() and ceil() API's

Approved-by: Gregory Nutt <gnutt@nuttx.org>

Ex:for input x = 1.0, the ouput should be 1.0, but the ouput was 2.0.

Signed-off-by: Lokesh B V <lokeshbv333@gmail.com>

The sign of integral part given by the modf() should be same as sign of input.
But for inputs between 0 and 1, the sign of integral part was not same as sign of input.

Signed-off-by: Lokesh B V <lokeshbv333@gmail.com>

Initial port to STM32F769I-DISCO

Approved-by: Gregory Nutt <gnutt@nuttx.org>

do not enforce CONFIG_STM32_CCMEXCLUDE for CONFIG_ARCH_CHIP_STM32F7, macro rename STM32 -> STM32F7, #include corrections