qemu-arm: Add license and copyright to files missing them.

All of these files are first-party code written from scratch as part of
this repository, and were added when the top-level MIT license was active,
so they have an MIT license by default.  Tracing back the git history show
the original authors/source/copyright as follows:

- main.c, mpconfigport.h: copied from the bare-arm port [1].

- test_main.c: added in [2].

- mphalport.h: added in [3] then updated in [4].

- mps2.ld, nrf51.ld, stm32.ld, uart.h: added in [4].

- imx6.ld, uart.c, startup.c: added in [4] and updated in [5].

[1] Commit c55721582282f282d33e35e458a2944890210ebc in 2014, the initial
    bare-arm port; see related ee857853d60a135685c5088e5492dfe6e8a5acb0.
[2] Commit c1c32d65af038ba1b2a2a8dd69e3f7e63eac5f3e in 2014, initial
    qemu-arm CI tests.
[3] Commit b0a15aa73540f82ef47c9492af7ce196d1b1a6e9 in 2016, enabling
    extmods and their tests.
[4] Commit e7332b05841549a41614e522285639dcaa7bd526 in 2018, big refactor.
[5] Commit b84406f3133a36a703a1506d754fc046dd955922 in 2021, adding
    Cortex-A9 support.

Signed-off-by: Damien George <damien@micropython.org>

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